Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 5: Tank pressure gauge

This document specifies tests and requirements for the tank pressure gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar1]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

Véhicules routiers — Équipements pour véhicules utilisant le gaz naturel liquéfié (GNL) comme combustible — Partie 5: Manomètre du réservoir

General Information

Status
Published
Publication Date
03-Jun-2021
Current Stage
6060 - International Standard published
Start Date
04-Jun-2021
Due Date
08-Jan-2022
Completion Date
04-Jun-2021

Relations

Effective Date
23-Apr-2020

Overview

ISO 12614-5:2021 specifies tests and requirements for the tank pressure gauge used in liquefied natural gas (LNG) fuel systems for road vehicles (as defined in ISO 3833). The standard defines construction, marking, performance and durability tests to ensure safe, reliable pressure indication in LNG vehicle tanks. It applies to LNG fuel system components but is not applicable to fuel containers, stationary gas engines, container mounting hardware, electronic fuel management, or refuelling receptacles.

Key topics and requirements

  • Scope and baseline working pressure: Based on a working pressure of 1,6 MPa (16 bar); other system pressures are accommodated by scaling test pressures (e.g., 2 MPa → multiply pressures by 1.25).
  • Marking: Component marking must enable traceability: manufacturer/agent, model/part number, working pressure or pressure & temperature range, and serial number/date code. Recommended markings include flow direction, fuel type, electrical ratings, certification symbol and ISO 12614-5 reference.
  • Construction and assembly:
    • Gauge must display at least 120% of working pressure.
    • If a gauge-type indicator, it must have a shatter-proof lens and a rear pressure relief.
    • Gauges installed inside driver/passenger compartments must be enclosed in a gas-tight housing with venting routed outside, or be self-venting within a sealed housing.
  • Required tests (see ISO 12614-2 for procedures):
    • Hydrostatic strength: test at 2.5 × working pressure.
    • Leakage: tested at specified temperatures and pressure factors:
      • < −162 °C: 1.0 × WP and 0.25 × WP
      • 20 °C: 0.25 × WP and 1.5 × WP
      • 85 °C or 120 °C: 0.25 × WP
    • Continued operation: endurance cycling for 7 000 cycles (pressurize to WP, depressurize to <50% WP) followed by leakage testing.
    • Other applicable tests: excess torque resistance, bending moment, corrosion, oxygen ageing, vibration, material compatibility.

Applications and users

ISO 12614-5 is intended for:

  • OEMs designing LNG fuel systems for trucks, buses and other road vehicles
  • Component manufacturers producing tank pressure gauges and instrumentation
  • Testing laboratories performing conformity and type approval testing
  • Type approval and certification bodies assessing LNG vehicle components
  • Fleet operators and safety engineers specifying compliant components for LNG vehicles

This standard helps ensure accurate pressure monitoring, safe venting, and long-term reliability of LNG tank instrumentation in vehicles.

Related standards

  • ISO 12614-1 - General requirements and definitions (LNG fuel system components)
  • ISO 12614-2 - Performance and general test methods
  • ISO 3833 - Road vehicle types, terms and definitions

Keywords: ISO 12614-5:2021, tank pressure gauge, LNG fuel system components, LNG vehicle, pressure gauge testing, hydrostatic strength test, leakage test, working pressure.

Standard

ISO 12614-5:2021 - Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 5: Tank pressure gauge Released:6/4/2021

English language
4 pages
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Frequently Asked Questions

ISO 12614-5:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 5: Tank pressure gauge". This standard covers: This document specifies tests and requirements for the tank pressure gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar1]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

This document specifies tests and requirements for the tank pressure gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar1]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

ISO 12614-5:2021 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO 12614-5:2021 has the following relationships with other standards: It is inter standard links to ISO 12614-5:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

ISO 12614-5:2021 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 12614-5
Second edition
2021-06
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 5:
Tank pressure gauge
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 5: Manomètre du réservoir
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . 2
5 Construction and assembly . 2
6 Test . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
Bibliography . 4
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects of gaseous fuels.
This second edition cancels and replaces the first edition (ISO 12614-5:2014), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— editorial changes.
A list
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